#if !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_)
#define AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#include <afxtempl.h>


//////////////////////////////////////////////////
// CMemDC - memory DC
//
// Author: Keith Rule
// Email:  keithr@europa.com
// Copyright 1996-1997, Keith Rule
//
// You may freely use or modify this code provided this
// Copyright is included in all derived versions.
//
// History - 10/3/97 Fixed scrolling bug.
//                   Added print support.
//           25 feb 98 - fixed minor assertion bug
//
// This class implements a memory Device Context

class CMemDC : public CDC
{
public:

	CRect	m_rectValid;
	CRect	m_rectClient;
	CArray <CRect,CRect&> m_arInvalid;

    // constructor sets up the memory DC
    CMemDC(CDC* pDC) : CDC()
    {
        ASSERT(pDC != NULL);

		m_rectValid.SetRectEmpty();

		if(m_arInvalid.GetSize()>0)  m_arInvalid.RemoveAll();

        m_pDC = pDC;
        m_pOldBitmap = NULL;
        m_bMemDC = !pDC->IsPrinting();
              
        if (m_bMemDC)    // Create a Memory DC
        {
            pDC->GetClipBox(&m_rect);
            CreateCompatibleDC(pDC);
            m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());
            m_pOldBitmap = SelectObject(&m_bitmap);
            SetWindowOrg(m_rect.left, m_rect.top);
        }
        else        // Make a copy of the relevent parts of the current DC for printing
        {
            m_bPrinting = pDC->m_bPrinting;
            m_hDC       = pDC->m_hDC;
            m_hAttribDC = pDC->m_hAttribDC;
        }
    }
    
    // Destructor copies the contents of the mem DC to the original DC
    ~CMemDC()
    {
        if (m_bMemDC) 
        {    

			if(m_arInvalid.GetSize()>0)
			{
				int nCount = (int)m_arInvalid.GetSize();
				for(int i=0;i<nCount;i++)
				{
					m_pDC->BitBlt(m_arInvalid[i].left, m_arInvalid[i].top, m_arInvalid[i].Width(), m_arInvalid[i].Height(),
								  this, m_arInvalid[i].left, m_arInvalid[i].top, SRCCOPY);
				}
			}
			else if(m_rectValid.IsRectEmpty())
			{
				// Copy the offscreen bitmap onto the screen.
				m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),
							  this, m_rect.left, m_rect.top, SRCCOPY);
			}
			else
			{
//				CStdioFile file("c:\\test.txt",CFile::modeCreate|CFile::modeNoTruncate|CFile::modeWrite);
//				file.SeekToEnd();
//				CString str;
//				str.Format("##  %3d  %3d  %3d  %3d  ",m_rect.left,m_rect.top,m_rect.right,m_rect.bottom);
//				file.WriteString(str);
//				str.Format(">>  %3d  %3d  %3d  %3d  \r\n",m_rectValid.left,m_rectValid.top,m_rectValid.right,m_rectValid.bottom);
//				file.WriteString(str);

				m_pDC->BitBlt(m_rectClient.left, m_rectClient.top, m_rectClient.Width(), m_rectValid.top,
							  this, m_rectClient.left, m_rectClient.top, SRCCOPY);

				m_pDC->BitBlt(m_rectClient.left, m_rectClient.top+m_rectValid.top, m_rectValid.left, m_rectClient.Height()-m_rectValid.top,
							  this, m_rectClient.left, m_rectClient.top+m_rectValid.top, SRCCOPY);

				m_pDC->BitBlt(m_rectValid.left, m_rectValid.bottom, m_rectClient.Width()-m_rectValid.left, m_rectClient.Height()-m_rectValid.bottom,
							  this, m_rectValid.left, m_rectValid.bottom, SRCCOPY);

				m_pDC->BitBlt(m_rectValid.right, m_rectValid.top, m_rectClient.Width()-m_rectValid.right, m_rectValid.bottom-m_rectValid.top,
							  this, m_rectValid.right, m_rectValid.top, SRCCOPY);


			}


            //Swap back the original bitmap.
            SelectObject(m_pOldBitmap);
			m_bitmap.DeleteObject();


        } else {
            // All we need to do is replace the DC with an illegal value,
            // this keeps us from accidently deleting the handles associated with
            // the CDC that was passed to the constructor.
            m_hDC = m_hAttribDC = NULL;
        }
    }

    // Allow usage as a pointer
    CMemDC* operator->() {return this;}
        
    // Allow usage as a pointer
    operator CMemDC*() {return this;}

private:
    CBitmap  m_bitmap;      // Offscreen bitmap
    CBitmap* m_pOldBitmap;  // bitmap originally found in CMemDC
    CDC*     m_pDC;         // Saves CDC passed in constructor
    CRect    m_rect;        // Rectangle of drawing area.
    BOOL     m_bMemDC;      // TRUE if CDC really is a Memory DC.
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Developer Studio will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MEMDC_H__CA1D3541_7235_11D1_ABBA_00A0243D1382__INCLUDED_)
